# US2 POLYMERS

This eighth-grade science lesson is about polymers. It is the second lesson in a sequence of six lessons on matter. The lesson is 99 minutes in duration. This class meets once a week for 45 minutes and twice a week for 100 minutes. There are 35 students in the class.

TimeCaption
00:00:49Good Morning! Fine, how are you?
00:00:56Sorry.
00:01:05Go away, Jeffrey.
00:01:35Yes, I think that would be a wise idea. Okay.
00:03:14Ah, ladies and gents my suggestion is to when you're working on your journal entry,
00:03:18if I were you I'd kinda go over your notes a little bit, too. Okay? Jason?
00:03:23I was absent Tuesday, so I need to make what I need to make up.
00:03:26Okay, well then you need to go and get the notes from somebody in class, okay?
00:03:31Because we had a minimum day that day so we took notes, and played around with two polymers.
00:03:38And I'm gonna see whether or not you guys can remember that.
00:04:45(inaudible) have something (inaudible)? No, those are your notes, right?
00:04:48Those are hers.
00:04:49Oh, those are hers, //(inaudible) lesson?
00:04:50//I was- //No, I (inaudible).
00:04:51//That's right, you (inaudible) studying. Okay.
00:04:57And who did you borrow those from, Ginger?
00:04:59(inaudible)
00:05:00Okay.
00:05:15Two things about polymers. Do you remember?
00:05:18Yeah.
00:05:19Okay.
00:05:48Okay, ladies and gents somebody in here raise your hand and tell me something that you've learned about polymers.
00:05:55Something that you know about polymers, based on last class period. Something that you know about polymers. Jim?
00:06:03Yeah, that uh manmade polymers are stronger than natural ones?
00:06:14Yeah.
00:06:20So they come in two kinds, manmade and natural. Somebody else? Charlotte?
00:06:23Doesn't poly mean many, many?
00:06:26Poly means many.
00:06:34And remember this sheet of paper here, you've used this before when we were graphing,
00:06:40to try to get as much information as you can about polymers because what can you do with this sheet of paper, that I'll let you do?
00:06:47Cheat.
00:06:48Yeah, yeah. You can use this for a test. Okay, Sam, uh, Terrence?
00:06:51They're gigantic molecules?
00:06:52They're gigantic molecules.
00:07:03Okay. Um, Daphne?
00:07:05Mono means one.
00:07:07Mono means one. And what's so important about mono?
00:07:13It takes three mono's to make a polymer.
00:07:15Well, it takes more than three mono's to make a polymer, cause we, cause //they're gigantic molecules,
00:07:18//Oh, okay.
00:07:19but give me kind of a definition of a monomer?
00:07:22A monomer-
00:07:24You kind of gave it to me, but kind of rephrase that.
00:07:28In other words, Daphne, if I were to ask you what is a monomer, what would you tell me?
00:07:32A chain? Wait-
00:07:43Anybody? What is a monomer? Uh, Aimee.
00:07:46Are they simple molecules?
00:07:48Yeah, they're simple molecules, so if we take the simple molecules, Daphne, we put them all together inside of a chain, what have we created?
00:07:57A polymer.
00:07:58Bingo! So mono means what?
00:08:00One.
00:08:01One. Okay, good. Anybody else? Crystal?
00:08:05Polymers are molecules joined together.
00:08:08Mono- okay, polymers are molecules joined together. And they're joined together, how are they joined together?
00:08:15I mean if you have to describe what they look like when they were joined together what would you tell me?
00:08:24(inaudible), I don't know, like, they're just around each other.
00:08:28They're around one another and they're linked together. What are they linked together in, Samantha?
00:08:34They can be- polymers can be linked together with a cross linker,
00:08:37but if you want to take a whole bunch of monomers and link them together what have you kind of created?
00:08:45A chain?
00:08:46Bingo! Thank you, a chain. Okay. So joined together and they're kind of like in chains, or they can be in chains,
00:08:54but with the ones that we talked about were in chains, okay? Anything else you want to add to this?
00:08:59"Mer" means molecules?
00:09:01Okay, we can write: "mer."
00:09:05I was trying to kinda remember, Gi-, remember "molecule," okay? Samantha?
00:09:11They can be all scrunched together?
00:09:15Okay.
00:09:16Up and down and side to side.
00:09:18Okay, good and this is what was really important because we're gonna take what Samantha has said,
00:09:23and we're gonna take this one step further today in class.
00:09:27Samantha mentioned that the polymers can kind of in chains- can kinda be arranged two different ways.
00:09:33She said, "side to side" and we'll call that "parallel" today. And then how's the other one? Do you remember?
00:09:39Scrunched together.
00:09:40Scrunched together kinda like?
00:09:42Crisscross?
00:09:43Kinda like crisscrossed. Okay.
00:09:49Okay, and this, ladies and gents, is what we're gonna focus on today, okay?
00:09:53We're gonna talk about parallel and cross linked chains and what actually does that do to the polymer.
00:09:58You guys remember the polymer, the newspaper polymer, do you guys remember that?
00:10:03Mm-hm.
00:10:04Do you guys remember that? Can somebody here tell me how were the chains arranged in the newspaper? How were the chains arranged?
00:10:10Dave?
00:10:11Like in order, the-
00:10:13Were they more arranged parallel or were they arranged crisscross?
00:10:16Parallel.
00:10:17They were parallel and because they were arranged parallel what could you what could you do to the newspaper?
00:10:21Rip it easy.
00:10:22You could rip it very, very easily. Okay, what was the other thing that we used in class? Does anybody remember?
00:10:28Aimee?
00:10:29Tyvek.
00:10:30Tyvek. And how were the molecules arranged in the Tyvek?
00:10:33Crisscross.
00:10:34They're crisscross, and what did the crisscross molecules do to the Tyvek?
00:10:39Made it very, very hard to tear. Okay? All right, so remembering that- parallel and crisscrossed-
00:10:45we're gonna go ahead and we're gonna take a look at this and we're gonna take a look at these arrangements of these chains,
00:10:51and how that kinda helps us determine what is ac- actually gonna happen to the polymer; how is the polymer gonna behave? Okay?
00:10:57All right, what I'd like you to do right now is take out one clean sheet of notebook paper,
00:11:02and if you would do me a favor and put your notebook on the floor, so the only thing that should be on your desk is a piece of notebook paper.
00:11:34Okay, I'm going to go over here on the overhead, guys; I'm not gonna turn the lights off because I'm not gonna be up here for very long, okay?
00:11:43But, what I want you to do, on your piece of paper, which is gonna kinda help us with the labs that we're gonna do a little bit later on;
00:11:57we are going to look at polymer chains, so what I'd like for you to do is to write down polymer chains-
00:12:03and this is a little bit background information-
00:12:06kind of a r- kind of a review from what we did last class period, but also to let you know where we're going with the lesson today.
00:12:30Okay.
00:12:33This is "monomers." You guys remember that when we kinda drew this picture of nylon last class period? Okay?
00:12:40This is actually polystyrene, which is up here; it's a plastic container.
00:12:43And one of the really, really neat things is that if you look at the polymers,
00:12:48and you look at all the names of the polymers, what's at the beginning of all the names of the- of the chemical names of the polymers?
00:12:55Poly.
00:12:56P-o-l-y, Poly, and that gives you a really, really good idea that that must be a polymer because it has p-o-l-y on it.
00:13:07And if we remember we've got one carbon atom; we have two hydrogen atoms that are bonded together to another carbon and hydrogen,
00:13:16that's your (monomeer), you take a whole bunch of monomers together and what have you created?
00:13:21Polymer.
00:13:22A polymer.
00:13:23A polymer. Okay, good. Okay, this is what we're gonna concentrate on in class today.
00:13:28The arrangement of chains can influence the behavior of the polymers.
00:13:44And it kinda goes back to our little bubble over there where we were talking about compounds are formed by combining two or more elements,
00:13:50whose properties are different from the original elements.
00:13:53Here you have a whole bunch of elements, you put them together and you've created something brand new.
00:14:34Okay. Based on what we talked about last class period- we talked about the newspaper and we talked about the Tyvek-
00:14:41would you please write down on your paper how the polymer chains were arranged in the newspaper,
00:14:47and how they were arranged in the Tyvek.
00:14:53Can we draw it?
00:14:54You may draw it. Absolutely.
00:15:31And would you also please write down, where Tyvek- uh, newspaper and Tyvek- would you also please tell me
00:15:37:what- how did that newspaper behave? In other words, because the polymer chains were arranged in such a way,
00:15:45how did the newspaper behave as far as tearing is concerned?
00:16:52Okay. Questions so far? Questions? Questions? Okay. Excellent! All righty.
00:16:58We're gonna go now into investigating polymers; and what I'd like for you to do on the same sheet of paper,
00:17:04is "Investigating Polymers Activity Part One." And this is gonna be a demo that I'm going to do, and then after the demo is over,
00:17:11I'm gonna break you up into your lab groups and then you guys are gonna take a polymer
00:17:15and you're going to investigate a polymer on your own, with your group.
00:17:55Okay.
00:18:03All righty. The first polymer- Jim, you want to share something?
00:18:10Uh, no.
00:18:11Okay. First polymer that I'm gonna share with you is- I want you to write this down on your piece of paper-
00:18:17it's this one right up in here. It's called plumber's tape. I don't know if you guys can see it from here.
00:18:22And you can really, really impress your parents today when you go home, and you can ask for plumber's tape, because that's what it's just-
00:18:30if you go into Home Depot and you say, "I need plumber's tape," they know exactly what you're talking about.
00:18:35But if you go into Home Depot and say, "I need poly tetra fluoro ethylene," they may not know what you're talking about.
00:18:49Here you've got the "poly" which means the "many." Does anybody here know what "tetra" means?
00:18:54Uh, like, uh-
00:18:57"Tetra" means a number. Can you-
00:18:58Yeah. It means, like- hold on, no, I thought (inaudible).
00:19:01Anybody here know what "tetra" means? Okay, tetra is a number.
00:19:05Usually what happens up in here is that they'll actually tell you how many of those, uh, molecules are actually bonded together.
00:19:13Fluoro is probably fluorine off of the, uh, element table and then ethylene is also another couple of different elements off of the Periodic Table.
00:19:21So you put all of these together and you'll get them all in a nice big old polymer chain and you create plumber's tape.
00:19:26Has anybody here ever fooled around with plumber's tape before? Do you guys know what I'm talking about?
00:19:30Duct tape?
00:19:31This stuff. Not duct tape, plumber's tape.
00:19:33Oh.
00:19:34Yeah.
00:19:35That's plumber's tape in here. Jim, share your experiences with plumber's tape.
00:19:38Yeah, its not sticky but it's like- it's when you wrap it, it squeezes really tight around things, it's like Teflon tape.
00:19:46You can fix gas leaks with it. That's what I used it for.
00:19:49Okay. And, that's what I use it for, to fix gas leaks and also it's really, really good for uh, water pipes and threading things like that, too.
00:19:58As a matter of fact, yeah, also known as Teflon, so you're correct in that assumption. Yes, Charlotte?
00:20:03I wrapped it around my finger and it turned my finger all purple.
00:20:06Well, yeah I think so. If you wrap anything around your finger it's gonna turn your finger all purple. Anybody else?
00:20:12Okay, I don't have a lot of plumber's tape to go around, but what I'm gonna do,
00:20:17is that I'm going to pass some plumber's tape around to some volunteers in the audience.
00:20:23Does anybody want to take a look at the plumber's tape?
00:20:26And I kinda dispersed it around that way you- people around you can take a look at it, too.
00:20:31The only thing that I'd like for you to do with the plumber's tape when you get it, is just to kinda leave it on your desk.
00:20:36Don't do anything to it other than just leave it on your desk. Nice and flat if you possibly can.
00:20:47Let's see. Jessica, I'll give you some. Theo-
00:20:57Okay, can everybody- Samantha, I'm going to give you some since you guys can take a look at that.
00:21:01What about over here on this side of the room?
00:21:07Okay, Jason, I'm gonna get you a piece, too, I think I have another piece up here. Okay. Yeah.
00:21:18You can't touch it?
00:21:19Yes, you can.
00:21:20You just leave it flat. Touch it and you can actually see how flimsy this is, too.
00:21:24And actually they'll make another type, this is more for, pipes and there is another one that's a little bit more flimsier.
00:21:33That's what we used this morning for threading, water pipes and stuff like that.
00:21:36How does it stick under the pipe?
00:21:38Actually, it just does it by, whe- eh, you're gonna figure that out. Okay? I'm not gonna tell you, you're gonna figure that one out. Okay.
00:21:45For those of you in here who have plumber's tape: do me a favor;
00:21:51see whether or not your ink pen or pencil, whatever that you're using on it right now, that you can write your initials on it.
00:21:58See if you can do that. With the plumber's tape.
00:22:00If you guys want to feel it, who doesn't have any, you guys can actually see what that feels like.
00:22:07It's kinda really smooth; it kinda feels good.
00:22:10Mine won't work.
00:22:11Huh?
00:22:12It ripped through.
00:22:13Me too.
00:22:14That's okay, it ripped through? Okay then maybe you don't want to go in too deep, then.
00:22:16Then don't, don't do that, then if it's ripping through, cause it's not a good thing. Oh good.
00:22:23Miss?
00:22:26Cool. Okay, good.
00:22:28All right, ladies and gents, we know this is a polymer because I told you that.
00:22:33The job is now to figure out how the polymer chains are arranged. We know the polymer chains can be arranged two different ways.
00:22:40They can be arranged parallel to one another, or they can be arranged crisscross.
00:22:46And if you had your super duper eyeballs on right now you actually could see this, you actually could see the polymer chains;
00:22:51but we can't see the polymer chains, so we don't have the super duper eyeballs,
00:22:55so we're gonna have to do a couple of things to it to try to figure out how the polymer chains are inside the Teflon or inside the plumber's tape.
00:23:03So what I'd like for you to do, is that you have the tape like this, lengthwise on your desk- everybody, Jason, got it? Okay.
00:23:11Now, do you see the tape? You see the top part of the tape and you see the bottom part of the tape? Top and the bottom part of the tape?
00:23:18I want you to ever so gently stretch it out. Just ever so gently stretch it out.
00:23:24Don't stretch it out to the point where you're gonna tear it, but go along your tape and ever so gently stretch it out. From top to bottom.
00:23:34Okay? And, other people in the classroom, if you want to take a look at what they're doing, make sure they're doing it right?
00:23:42See, it kinda makes a cute little ribbon.
00:23:46Okay?
00:23:47I didn't make a cute little ribbon.
00:23:48You didn't make a cute little ribbon?
00:23:50No, mine's (inaudible), and then we got a pink //(inaudible)-
00:23:51//Okay.
00:23:52It looks like yellow bacon.
00:23:53Looks like yellow bacon, okay. So, that's something that I could do with this. Okay, can you guys see that? All right.
00:24:00Now, I stretched it this way. Did that tell me anything about how the chains were? //In the- in the tape?
00:24:07//Yeah.
00:24:08No.
00:24:09Did you learn anything about how the chains were aligned in the tape? No you didn't. Okay.
00:24:13Now what I want you to do, is take one end and take the other end and I want you ever so gently to stretch it that way.
00:24:23And tell me what happens.
00:24:27The chains... go back to normal.
00:24:30Back to normal.
00:24:31It goes back to normal. Okay? And if you want to have your other partners or somebody who didn't have a chance to do this, do this again.
00:24:38It's stretching this way; and I'm kinda getting a little distorted- if I were to write my name on it and stretch it like this,
00:24:44my name would be real distorted.
00:24:45But if I were to pull like this I would have my name nice- nice and original again; normal again.
00:24:52What does this tell you?
00:24:53Someone in here raise your hand and tell me what you think this tells you about how the polymer chains are arranged.
00:25:00Do you think the chains are arranged parallel to one another or do you think they're crisscrossed? Based on what this can do.
00:25:08Do you think they're parallel to one another or do you think that they're crisscrossed? Depending on what I can do with this.
00:25:22I see some hands going up. Some hands going up.
00:25:30Jessica.
00:25:31Parallel.
00:25:32They're parallel. And why do you think they're parallel?
00:25:34Because you can stretch it from side to side and it's kind of easy to do, and if it was crisscrossed it would be harder.
00:25:42Yeah. I agree with that. I don't know if you kinda heard what Jessica said,
00:25:46but she said because of the fact that you could pull them side to side and then you can get it to go back into its original shape again,
00:25:53just by pulling it this way, its giving you an indication that the chains are parallel.
00:25:57If the chains were crisscrossed do you think we'd be able to get it back to its original way real quick? No, we don't. Okay.
00:26:03So, what I want you to do on your paper right now- you've written down "plumber's tape"-
00:26:06what I need you to do now, is to tell me in your own words, what evidence- or how did you know in other words with the chains-
00:26:18How were the chains arranged?
00:26:31And what evidence do you have
00:26:38that the chains were arranged in that certain way?
00:26:40In other words, if you think that the chains were arranged parallel,
00:26:43then tell me what evidence did you see that gives you an indication that the chains were arranged parallel.
00:27:11(inaudible), well you really got yours stretched out, huh?
00:27:14(inaudible) I had- I got carried away with it.
00:27:15You got carried away with it, so what do you think happened to your poor chains?
00:27:18I ripped it.
00:27:19Yeah.
00:27:20You ripped it, too.
00:27:21And I ripped it too.
00:27:25This brings up a point. Jason's poor plumber's tape, he really got it really stretched out.
00:27:31But I (supported) my scientific thing.
00:27:36You- okay. You took it one step further. What do you think happened to these poor polymer chains? From what Jason did to them?
00:27:43What do you think happened?
00:27:44They got //broken.
00:27:45//They got stretched too far so they ripped.
00:27:47Yeah. Stretched too far so they ripped, very good.
00:27:52Okay, whenever you stretch the tape out do the chains get more compressed or do they just come closer together;
00:27:57or do they actually get more like- do they all get thinner?
00:28:00They will actually stretch out and get thinner. Well, I shouldn't- and sometimes that all depends, too.
00:28:09Okay? All right.
00:28:13Now, I'll give you about another minute to finish this up because the next part I have not been successful with all day long,
00:28:20and I hope I'm going to be successful with it today. I was semi-successful with it yesterday.
00:28:28Jim?
00:28:29But still, if you got, like, your arm cut off or something, then all your polymer chains will be cut and everything?
00:28:33Oh, absolutely.
00:28:34Oh. Oh.
00:28:37Absolutely.
00:28:38Then how do you have polymer chains in your blood, DNA, and everything?
00:28:40Well that's because you got to consider all polymers as a gigantic molecule. It's smaller molecules put together.
00:28:46So all the molecules that you have- not all, but quite a few of them- are gigantic molecules
00:28:51and all they are just smaller molecules that are hooked up together.
00:28:54So whenever, like, you find a piece of DNA that's not like your entire DNA string, //(it's just a little piece).
00:29:00//No it's not. It's a little //piece.
00:29:01//So is your entire DNA string, like, going up and down through your body all the way?
00:29:05No. You've got to remember, if you remember this in seventh-grade science, if you were to take a cell and look inside of your nucleus,
00:29:11that big old gigantic molecule is really, really, coiled inside the nucleus. Do you guys, do remember that? Okay.
00:29:18And, yeah, and you can actually stretch that molecule out its very, very long.
00:29:23But it's not all up and down your arm. It's compacted inside of every single cell inside of your body, that has a nucleus.
00:29:31How are polymers arranged inside the body?
00:29:34It all depends. All depends. Um, some could be arranged parallel, some could be arranged crisscross, some could be cross-linked together.
00:29:43All depends on what they're what they're needed for, what they're used for. Okay? Any questions? Any other questions?
00:29:49Okay, this one I haven't been- like I said I've been somewhat successful with it all day long, but I'm not a hundred percent sure,
00:29:56this will be the last demo that I do and them I'm gonna break you up into your lab groups for you to investigate your own polymer.
00:30:02Did somebody in here know how to blow up a balloon really, really well and tie it off?
00:30:06I do!
00:30:07I do.
00:30:09(inaudible)
00:30:10Jason pulled (inaudible).
00:30:11Jason-
00:30:15Do me a favor, when you blow the balloons up, don't blow them up all the way.
00:30:20Okay, (inaudible).
00:30:26No, ta-, that's- that's cool, right there. That's good.
00:30:39(inaudible)
00:30:40Thank you.
00:30:42Thank you. And Jason is dying over there, huh?
00:30:48I like balloons.
00:30:51Thank you. Okay. All right, we've got another problem.
00:30:57We have found another polymer and we want to investigate again how the polymer- the chains in this polymer are arranged, okay?
00:31:05So we're gonna do a couple of things to the balloon to figure it out. Uh, what I'm going to do I'm gonna take a skewer.
00:31:11I'll dip it in some oil just to be on the safe side to make it go in a little bit, how should I say, a little //smoother. Okay?
00:31:17//Easy?
00:31:18Where should I put the skewer? Somebody in here tell me. I want to see whether I can figure out,
00:31:24like we did with the plumber's tape we stretched it different ways to see whether or not we could figure out how the chains are going.
00:31:29Uh, same thing with the balloon. Jim, //what do you think?
00:31:31//Right on top
00:31:32Poke it right on top.
00:31:33Poke it on the top?
00:31:34Yeah, right there.
00:31:35Okay. Anybody want to go in the side?
00:31:38Ah, Stuart wants to go on the side. Okay, Stuart doesn't want to go on the side, all right.
00:31:43Stuart, we're gonna go on the side, for you, okay?
00:31:46We're gonna go on the side. What do you think's gonna happen?
00:31:48Pop!
00:31:49Pop.
00:31:50It's gonna pop.
00:31:51Why?
00:31:52I think it'll go through. I think.
00:31:53You think it'll go through?
00:31:54Yeah.
00:31:55Okay, let's see what happens. Okay, ready?
00:31:59Oh golly, //that popped.
00:32:00//That popped; that was a big one.
00:32:01Okay.
00:32:05Now do it right in the bottom; right where all the thick stuff is.
00:32:07Right where all the thick stuff is, huh?
00:32:09Yeah, might not pop there.
00:32:10Do you think the, the, the thick stuff is not on the side?
00:32:15No.
00:32:16No?
00:32:17No, cause-
00:32:18Cause it's stretched out inside there on the top, but down where the bottom is it's not blown up all the way, so it's thicker on the bottom.
00:32:21Okay. Let's find out. Okay.
00:32:23(inaudible)
00:32:24Okay.
00:32:26(inaudible) popped.
00:32:32Just to be on the safe side.
00:32:36Oh, it still popped!
00:32:38That's because I haven't been successful //with this all day long.
00:32:39//Try the bottom, the bottom. Where the little tie thing is.
00:32:42No, put it-
00:32:43At the bottom.
00:32:44Where it's tied.
00:32:45Tie thing?
00:32:46Yeah.
00:32:47Okay.
00:32:50I don't like that one.
00:32:52Yeah, get a new one.
00:32:53Okay.
00:32:54I wanna see that one (inaudible).
00:32:57You're sure, huh?
00:32:59Oh!
00:33:00There we go!
00:33:01Now the other side.
00:33:02Ah!
00:33:04(inaudible) too long.
00:33:05Here I'll blow one up again.
00:33:06Okay. Well whatev- give me two more, cause I told you: sometimes I'm- this is working and sometimes its not.
00:33:12But so far we got one part of it working, right?
00:33:14(inaudible) yes, sure.
00:33:16And don't blow them up really too- don't stretch them out too much.
00:33:19I want the long one.
00:33:21Here, try that one.
00:33:22Oh, yes.
00:33:24Okay, good.
00:33:31Thank you. Perfect.
00:33:35(inaudible)
00:33:36I'm gonna be successful with this.
00:33:38Yes.
00:33:40Use the force.
00:33:41Use the force. Okay.
00:33:47All righty. Here I go! Should I try a different skewer?
00:33:51//Okay. Okay. Here we go! I'm gonna go from this end first.
00:33:56It's gonna pop.
00:33:57It's gonna pop.
00:33:58Don't say that!
00:33:59Oh well.
00:34:01Pop.
00:34:02There we go!
00:34:03Ah! Success.
00:34:04This is my balloon! It's my (inaudible).
00:34:06Okay, okay. All righty.
00:34:09What you need to do now is that- I was- when I put the skewer going in this way, it popped;
00:34:14but when I put the skewer I this way, it didn't pop.
00:34:18What's the difference between the chains here and the chains here?
00:34:23What's the difference? What's the difference? Crystal?
00:34:26It's parallel.
00:34:27Well, don't know if it's parallel. What's the difference between the way the chains are arranged here?
00:34:31Not so much whether their parallel or crisscross right now, but Jim had said this before. Jason?
00:34:37Uh, the ones on the side are like, I guess, like so stretched apart that it, when you hook something in it,
00:34:42it just, like, makes it pop cause it won't stretch into where you (inaudible) to go inside.
00:34:46Okay, and then what about the top?
00:34:48And then the ones on top aren't as, like, stretched apart or pulled so tightly;
00:34:52they're so loose so you can just stick something in it and (it will) pop right away.
00:34:55Okay, excellent. So how do you think the polymer chains are arranged? Do you think they're parallel or you think they're crisscrossed?
00:34:59Ones on the top are parallel and the ones on the side are crisscrossed?
00:35:04Okay. Anybody else (has anything) different, Jim?
00:35:06I believe the ones on the top may be crisscrossed because that means they're closer together and then so you could stick something through,
00:35:14and they, like, squeeze around it easier and do not have to (explode);
00:35:17and the ones on the bottom and the ones on the side are stretched out a little more so they're more like crisscrossed,
00:35:21so when you stick something in they just like (inaudible).
00:35:24Okay.
00:35:25(Question.)
00:35:25Okay. I like that explanation. And what Jim said was, he felt that the polymer chains are crisscrossed.
00:35:33The ones at the top are crisscrossed, they're not stretched out, so when you poke something through it, the chains just kind of- what was the word that you used?
00:35:41Squeezed around it.
00:35:42They kind of squeeze around it, whereas a polymer chain- the crisscross polymer chains on the side are a little bit more stretched out,
00:35:49and so when you try to put a skewer through it, are you really getting- you don't- they can't squeeze together.
00:35:54I think that's the word that he used. The polymer chains can't squeeze together. Okay?
00:35:57So, we learned that the balloon is what type of polymer? Parallel or crisscrossed?
00:36:02Crisscrossed.
00:36:03Crisscrossed. And this is a little bit more compacted than this over here. So what- what can you tell me about polymers?
00:36:13Think about this. According to the balloon, what can polymers do? What could we do to them?
00:36:22Somebody's saying it, I can hear it.
00:36:23They can stretch out.
00:36:24Yeah, they can stretch out, so polymers can stretch out.
00:36:27What I want you to do here now: same thing, same question. How are the chains arranged,
00:36:34and what evidence do you have if the chains are arranged that way?
00:36:41And if you guys want to draw a picture, you can go for it and draw a picture, it's not a problem.
00:37:03Okay.
00:37:46So, just out of curiosity, going back to that little original statement that we started out with today in class
00:37:51:the arrangement of the chains can- can kinda give me an idea of what's gonna happen to the behavior of the polymer;
00:37:58and chains- crisscrossed, stretched out in the balloon- made the balloon pop;
00:38:05chains compacted together at the top: I can put a skewer through it and it's not going to pop.
00:38:13Okay, so the way the chains are arranged, tells me something about the behavior of the material.
00:38:28(inaudible) is not here. Are you understanding this all okay? Okay.
00:38:34He hasn't been here for a while. Was he on vacation? He is? Okay.
00:38:45Okay, it looks like pencils are down.
00:38:48All right, somebody now: tell me something else I can write on this paper, what I just know about polymers.
00:38:55What did you learn about polymers today? What could you write down on there?
00:38:59Cedrick?
00:39:00Polymers can expand.
00:39:02Oh yes, polymers can expand.
00:39:10Or you can use the word "we can stretch the polymers out."
00:39:13Anything else? How's bingo? Bingo, bingo. Okay, nothing else? Nothing else.
00:39:22Okay, please go ahead and take this paper, now flip it over to the back, because now I'm going to let you investigate one on your own.
00:39:29Okay? All righty.
00:39:33And the one I'm going to have you investigate on your own, is this one here.
00:39:41and you may want to copy this down, or you should copy this down on the back of your paper,
00:39:45so that there's not going to be any questions- you won't have any questions when you go into a lab, hopefully.
00:39:49Okay, investigating polymers. We investigated the balloon and we investigated the plumber's tape.
00:39:57I'm gonna have you go out and investigate the- a plastic container, or the polystyrene.
00:40:05And that's what you're going to investigate right there.
00:40:09Again, we have this question in our head, we have to figure out how these chains are arranged.
00:40:15You're gonna do a couple of things to this plastic container to see whether or not you can figure out how the chains are arranged.
00:40:26And here's a monomer,
00:40:30a polystyrene-
00:40:43Okay.
00:40:53(And), as you're writing this I'm gonna go ahead and share with you, you guys can go into your lab group, three to a lab group.
00:41:01You may choose who you'd like to work with and after I go over the instructions I'm gonna tell you,
00:41:07"Okay guys, you have a minute to fi- or actually 30 seconds to find the partners and a lab station," okay?
00:41:15Okay, so I know you're all looking around at one another going "yeah, yeah, yeah," okay? Okay.
00:41:23But let me have your eyeballs back up here because we gotta go through this.
00:41:26Okay, first thing: you're gonna take your polystyrene container, your plastic container,
00:41:31and I'm gonna show you what the plastic containers look like. Plastic containers look like this.
00:41:37You guys all recognize these plastic containers. Where do you see these?
00:41:44Look!
00:41:45Oh those are the cheesy hamburgers you get-
00:41:47Yeah, the cheesy hamburgers are in there. Yeah, okay? In the cafeteria.
00:41:50All right, what you're gonna do is that you're going to take this plastic container and you're going to cut into a shape.
00:41:58And you guys can choose whether you want to cut it into a square, rectangle, or triangle.
00:42:03The only reason why I'm asking you for those three particular shapes is because they're kinda easier to measure.
00:42:08I don't care how big you cut this out; I don't care how small you cut this out, that's your choice.
00:42:15What I would like for you to concentrate on in the container, though, is if-
00:42:23there's a very, very flat part to the container. Do you guys see the flat part?
00:42:26Okay, so when you get into your lab groups, you just need to make sure that you're cutting off those ripply edge stuff.
00:42:33Okay?
00:42:36And I'm not doing a very good job.
00:42:45I cut the flat part out. Okay, from the flat part-
00:42:50from the flat part then you can cut your triangle, you can cut your square, you can cut your rectangle and you guys can cut it any size.
00:42:57Just remember you have two flat sections here for three people.
00:43:02So you're gonna have to figure out how you're going to divvy up two sections for three people, okay?
00:43:07All right, so that's the first thing you're gonna do. Second thing that you're gonna do-
00:43:12and I had a piece here from this morning don't know what happened to it-
00:43:16you're going to trace the figure.
00:43:18So once you cut the figure out, I want you to trace it, and then I want you to take measurements.
00:43:26And I'm gonna tell you how I want you to take these measurements.
00:43:33You have rulers, in your containers back there at your lab station. What you need to do, is that you need to measure the sides. Okay?
00:43:45I don't want to know length, times width, times height, I don't want to know that;
00:43:48all I want you to do to is tell me how- just take the measurement of the length or actually, of all the four sides;
00:43:56or if you have a triangle then you have three sides, okay? You're gonna take these measurements in?
00:44:02Centimeters.
00:44:03Centimeters. Then, you are going to go and you're going to give me a measurement of mass.
00:44:16Now, what is in the classroom that's going to help you figure out how the mass of the little piece of plastic?
00:44:22What's hanging around here? Daphne?
00:44:24The triple beam balance.
00:44:25The triple beam balance. So you're gonna use the triple beam balance to help you figure out the mass. And how do you measure mass? In?
00:44:31Grams.
00:44:32Grams, okay.
00:44:34And then, give me some characteristics of the plastic. In other words, after you've cut your little shape out, tell me, what does it look like?
00:44:43Tell me something about the physical characteristics of that piece of plastic.
00:44:50What does it feel like? What does it smell like? Don't taste it.
00:45:03And you're going to do all of this two times. You're going to do this- yeah, watch, before you heat it and then after you heat it.
00:45:13Where as with the plumber's tape we pulled it and as with the balloon we skewered it,
00:45:18with this piece of plastic we're gonna put it in the toaster oven and we're gonna see what happens.
00:45:23So I've got the toaster oven up here. I'm gonna man the toaster oven.
00:45:31So, once it's been heated you're gonna take it back to your lab station and you're gonna do all this all over again. Question?
00:45:38What if- what if whenever we heat it, it like melts and we can't touch it?
00:45:42Oh, I don't know we'll have to see. Okay? We'll have to see.
00:45:47You have to put all this information, the before and the after heating into a data table.
00:45:55You guys remember what your data tables looked like from before in the past, right? Okay, I'm not gonna give you the data table today,
00:46:02I want you and your partners to figure out what your data table is going to look like.
00:46:06You just need to know that your data table has to have all of these elements inside of it, before and after heating;
00:46:12and you have to have all of this for all three of you lab partners on one data table.
00:46:18So what I mean is: if Samantha, Terrence, and myself were a team, we would all cut out our own different shapes,
00:46:25we'd all cut out- figure out our own different measurements, but we would share them with one another.
00:46:31So by the time I'm done, I have Samantha's, Terrence's, and my own all on the data table. Before and after. Is that clear?
00:46:40Yes.
00:46:41Is that clear? Because there was some confusion about that this morning in class. So you're gonna put everybody's data on here.
00:46:47You are going to trace everybody's figure on your paper.
00:46:51So when you create your data table you need to keep that in mind, okay? Cedrick? Question?
00:46:56No, I just (inaudible).
00:46:58Okay. All righty.
00:47:02No questions? I think I've covered everything. Tuh-duh, tuh-duh... Yep, I have. Okay.
00:47:09When you are done with your before heating measurements and you want to come up to the toaster oven, raise your hand,
00:47:16and then I will call you, group by group, to the toaster oven. I'm gonna man it and then you can take your plastic back to the lab, okay?
00:47:25So when you're ready just raise your hand and I'll let you come up here and we'll put it in the toaster oven.
00:47:32If you're done with the whole entire lab, you're done with the before and you're done with the after,
00:47:37and you're done with all the measurements and everything else that you need to do,
00:47:40there are some conclusion questions that are on the board behind this board over here.
00:47:46And somewhere in the middle of the lab, I'll push that board over so that you actually can see those conclusion questions, okay?
00:47:53Ladies and gents, this is a lab today that you need to make sure that you are taking very careful measurements. What did I just say?
00:48:03Very careful measurements.
00:48:05Okay, very careful measurements, because- I'm not gonna tell you, but yeah, just go ahead and take very careful measurements, okay?
00:48:13Okay, 30 seconds, find your partner and lab station.
00:48:52Do you type those?
00:48:55Um, eyeballs?
00:49:01Let me double-check and see who you're working with real quick. Three, three, three, three. You three ladies are together?
00:49:07Julia, who are you with? You two. Okay. Three, it's you three?
00:49:13Yeah.
00:49:14Okay, you three, and you three. Okay. Do me a favor, Monica, would you guys scoot down a little bit? Yeah, thank you.
00:49:21Keep scooting. That way we can get that group in totally over there.
00:49:29Scoot all- yeah, yeah, yeah, good. Arthur scoot down some more. Take your stool, yeah, take this stool and go right in the middle over there.
00:49:39Okay. Once I hand out your plastic containers, you guys can go ahead and start.
00:49:56Okay gentlemen, here you go.
00:50:05Oh yes, yes, hurry up. Give me your (inaudible) I'll give you a pass. You three ladies are together?
00:50:12Mm-hm.
00:50:13Is it just you and Charlotte?
00:50:15Yeah.
00:50:16Okay, (just go). There you go.
00:50:23Just you three gents? You got some extras here, so use this and that.
00:50:28(inaudible)?
00:50:29Yeah, good question guys: if you need extra scissors or rulers they're on my table next to my lab station.
00:50:57(inaudible) background music, it has to be Star Wars.
00:51:05You know what, there is another pair of scissors on the lab table over there. Let me get you some (inaudible) containers.
00:51:17(And then we) cut into this, right?
00:51:18I don't know, (inaudible) whatever you want.
00:51:21I'll get this (inaudible). It says, "Don't count (inaudible)."
00:51:27That's why I'm counting right here.
00:51:54(inaudible) how are you gonna organize this data table?
00:51:58Um-
00:51:59Mm... yeah?
00:52:02Yes, what do you need?
00:52:05Do we need (to trim it) in three ways?
00:52:06Yes, you do. Okay?
00:52:09So if I were you, I would cut out whatever you have left over you can give to Leon.
00:52:15(Math).
00:52:16Okay, that's a good idea, too.
00:52:18And that will be a rectangle.
00:52:21Did you guys just get one container?
00:52:23Yeah.
00:52:24No, here, two. Okay.
00:52:25Rectangle, we got it.
00:52:52Jason, question?
00:52:56What do you need?
00:52:57Rulers.
00:52:58They should be up there. Where are they? Oh, here they are.
00:53:00I make a square.
00:53:01What are you making?
00:53:04What are you making?
00:53:05I must have //put them away yesterday, by accident. There you go.
00:53:06//Are you gonna make (inaudible) this?
00:53:07A rectangle?
00:53:08A rectangle?
00:53:09(inaudible) (kind of) make a small one.
00:53:13Okay, I've got one over here.
00:53:17How are we supposed to measure it, like... Are we supposed to just put all the measurements in order?
00:53:22"Measure in centimeters." You should have paid attention.
00:53:24I know centimeters, but I mean: does she want us to put them all in one, like one side is seven; the other side seven, what-
00:53:31(inaudible)
00:53:32Actually, it's pretty much clean; I cleaned them all yesterday //so you should be okay.
00:53:33//Okay. It's at seven and a half.
00:53:35You want to double check and make sure it's aligned correctly. //Okay?
00:53:37//We have to check.
00:53:42And where is your shape? Okay?
00:53:46Now if you guys need more rulers, you go over to my table and get some.
00:53:52Yes, Lance.
00:53:53(inaudible)?
00:53:55Absolutely.
00:54:04Hey gentlemen, before you start, (inaudible) think about- let me you look at your data table.
00:54:08How did you pull that, how did you arrange that data table?
00:54:11What data table?
00:54:12Oh, the //(inaudible)
00:54:13//Yeah.
00:54:15(inaudible) you have to have a data table (inaudible). Or not?
00:54:19All of you have to make a data table. Remember?
00:54:22Yeah, but (inaudible) paper.
00:54:23We were all having- (I first would have) his data table, my data table and his, (inaudible)
00:54:30there's three different data tables but they all have the same (inaudible)-
00:54:33(inaudible). And you were correct, okay?
00:54:35But, you guys need to talk about how you're gonna put that data table together before you do anything.
00:54:39Oh, okay.
00:54:40Okay?
00:54:41You just make a square, and then (inaudible) before and after.
00:54:44Why not do a triangle? Triangles are cooler.
00:54:48I know that, I know that but-
00:54:49(inaudible)
00:54:53Ladies... oh yes, you do have a data table. Let me take a look at that.
00:55:03Is this yours?
00:55:04Yeah. //(inaudible) table.
00:55:05//How is this gonna fit in-
00:55:06Oh, we have to (trim).
00:55:07Yeah. So how is that gonna //fit in there?
00:55:12//Um, mine could fit.
00:55:14So maybe you need to expand them. But they're good, just make them a little bit bigger.
00:55:19I need like another piece of paper or something.
00:55:22Yeah.
00:55:25Um, woo... Do I like fractions?
00:55:28No.
00:55:29No, I don't.
00:55:31Anyone got paper?
00:55:32I got paper, I got-
00:55:34And, have you guys figured out how you're gonna put your data table?
00:55:37Yeah. Fourteen sixteenths.
00:55:38Yeah. You know what, if I were you I'd re-measure that, and it will give you a decimal.
00:55:41How do you do it with a decimal?
00:55:42Watch.
00:55:43Oh, you get a decimal?
00:55:44Yeah. You guys know there's no fractions in here, so this is seven- it looks like it's about seven-
00:55:53(inaudible)
00:55:54point two. Yeah, so you have to do it in centimeters.
00:55:55Okay, I (try).
00:56:02So I'm concerned- you got a before and you got an after, but where is the room on the data table for his info and his info?
00:56:13Uh, I'm gonna do that later.
00:56:15Ah, we wanna try, like, now.
00:56:17Okay.
00:56:18Okay?
00:56:19I just need a new piece up here, cause-
00:56:20Go get a- go get another piece of paper if you need it.
00:56:22I don't have enough paper.
00:56:23I'm just gonna get down and (inaudible)-
00:56:24Okay.
00:56:45Gentlemen, let me see your data table.
00:56:54Let's re-group here, okay? You have to get- is this your figure?
00:56:59Yeah, it's my figure.
00:57:00Okay. You have to get all the (inaudible)- let me see your piece of plastic. Your piece of plastic. Where is the other?
00:57:09Okay, you gotta get all three of these somehow traced on your paper because that needs to be included in your data table, okay?
00:57:22[BREAK BETWEEN TAPES]
00:57:24This one looks like its chipped and you're going to just give me a measurement here, this looks to be about four point nine?
00:57:33Yeah, maybe four point nine centimeters,
00:57:36Mm-hm.
00:57:37So when you trace it, you can put down on this side "four point nine centimeters," //okay?
00:57:40//Oh, okay. (Inaudible)?
00:57:42Yeah, yeah and you know what? Sometimes an easier way is just to put all your data inside of it. Does that make sense?
00:57:50Oh, (inaudible).
00:57:51Okay.
00:57:54(inaudible)
00:57:56Yeah, okay. And how are you guys coming along here?
00:58:00Good, we got our data table.
00:58:02Yep.
00:58:03Almost.
00:58:04Almost?
00:58:06He stole my ruler.
00:58:07Okay, so you got before and after. So share with me what's gonna go in here.
00:58:11The uh-
00:58:12That's um-
00:58:13the- the characterization-
00:58:15The characteristics?
00:58:16Yeah. Before and then after you heat it up.
00:58:18Okay, now do you have enough room to trace it?
00:58:21Yeah.
00:58:22Let me give you a hint here. You can trace it; then you can put all of your //data-
00:58:26//information inside of it!
00:58:27Bingo!
00:58:28Yes!
00:58:29Yes.
00:58:30Why didn't you tell me before?
00:58:31Well, that's an easy way.
00:58:32I could poke an eye on it.
00:58:33So now I have to make //my data table out of my whole piece of paper.
00:58:34//Yeah you can, be careful.
00:58:36No, not necessarily. Just erase these little lines and just kinda extend the data table down //longer.
00:58:41//Oh.
00:58:42Right.
00:58:44What are you doing?
00:58:45Okay, I was gonna ask what (you)-
00:58:49Good, I like it!
00:58:51Thank you.
00:59:03(inaudible), what was your side one?
00:59:14Yes?
00:59:15I think we forgot (inaudible).
00:59:16Well, let's double-check.
00:59:20I need to copy (inaudible). Um-
00:59:26So, you have to tell me is this before heating or after heating.
00:59:29Before.
00:59:30Okay, somehow you need to let me know that.
00:59:31Okay.
00:59:32Okay?
00:59:33All right.
00:59:34And you ladies, how are you coming along?
00:59:36Oh-
00:59:37(inaudible)
00:59:39So-
00:59:41S?:00]
00:59:42Okay, that's smart. And then you can put all your measurements on the inside, okay? That's good.
00:59:49Of each one?
00:59:51Yeah.
00:59:53(inaudible)
00:59:58Gentlemen, (inaudible) done? Are you done? Are you massing? Finding the mass? What are you doing?
01:00:02I'm measuring.
01:00:04Okay, your measuring. Stuart, what are you doing?
01:00:06Waiting for the ruler.
01:00:08You can always get another one off of my desk.
01:00:15It's crazy!
01:00:20Jason, are we having a conversation about polymers?
01:00:23Yeah.
01:00:26The polymer of my polymer of my, uh-
01:00:29(inaudible)
01:00:32All right. So, I don't have to make a (inaudible) table, right?
01:00:34You got to get carpet in here because carpet cleans your erasers.
01:00:37No, no carpet in a science room.
01:00:39(inaudible) erase the ground.
01:00:44Now how do I make the graph?
01:00:47You don't have to make a graph, dude.
01:00:50Do you want me to (inaudible) all the sides of the others?
01:00:52No, you're not going to give me (inaudible), you're not going to give me a (parameter) or an area; all you've got to do is give me the measurements.
01:00:57Oh.
01:00:58Okay? Your not going to do any type of math calculation today.
01:01:00Awesome.
01:01:01Awesome, huh?
01:01:14Yes.
01:01:16Are you guys ready to heat?
01:01:17Yeah.
01:01:24If I were you, I would somehow put this- block this off and put a title up here before heating.
01:01:31Okay.
01:01:32Block this off and put a title here after heating,
01:01:34okay, that way you can tell the difference. Okay? So, Daphne, you're almost done?
01:01:40(inaudible)
01:01:41Okay.
01:01:46Now, what are we tracing?
01:01:52I'm (writing the atom)? Or-
01:01:55Yeah.
01:02:01No, look, Theo, look at your writer. The very first- the- yeah.
01:02:04Yeah, but (inaudible).
01:02:07Do we have to put all (in there)?
01:02:10You can make it even.
01:02:13I'll do mine, you do yours. (Just like we don't know it).
01:02:22Do we have to graph it?
01:02:24Did I say anything about graphing?
01:02:26Or, like-
01:02:27No.
01:02:28Yes, the data table, and this looks to me like you've got one coming here, okay?
01:02:33So you're all right. So do you have everybody's data?
01:02:37Yeah.
01:02:38Okay, do you have all the masses?
01:02:40Yeah.
01:02:41Okay, let me double-check your masses here. Where am I gonna find that on your data table?
01:02:47Right here. Inside the little (inaudible) shape.
01:02:50Well then you're going to need to identify how it's being massed.
01:02:53Shall I put "mass" above it?
01:02:54Okay that's fine, as long as I know what the mass is.
01:02:59Oh, (it did) it perfect.
01:03:01I know, I changed it.
01:03:02No, I changed it.
01:03:04I changed this little (knot).
01:03:05No, I changed it.
01:03:11Are you guys ready to heat?
01:03:13Yeah.
01:03:14Yeah.
01:03:15Mm.
01:03:20But see? Now what do you do?
01:03:22Oh, wait-
01:03:23Oh-
01:03:25So, my suggestion to you is- am I looking at data here for before heating or after heating?
01:03:33Before.
01:03:34Okay, so make sure I know that. You gotta- How do- how do I know that?
01:03:39You make another thing; you (inaudible) down here?
01:03:42You (can't) do that, so if I were you I'd scratch that out so that I know that you're doing- yeah.
01:03:47(inaudible) do that.
01:03:48That's fine. Maybe you wan- want to block the whole thing off so I know that's all before heating.
01:03:55Here. Right here.
01:03:57Okay, good.
01:04:01All right. Okay, I think you guys are ready.
01:04:06Yeah.
01:04:07Okay, bring your plastic on up.
01:04:10Okay, ladies and gents... Shh, eyeballs.
01:04:18Eyeballs...
01:04:21Okay. If you are- if you're done with your measurements, your before heating measurements, you can raise your hand,
01:04:29and then I will call you up here, okay? Once you're done, go back and do the after heating measurements.
01:04:35Once you're done with all the after heating stuff then you are to?
01:04:40Record?
01:04:41To record it?
01:04:42Record it?
01:04:43Absolutely record it, but say for instance everything's done with your lab, what are you gonna do next?
01:04:49Sit in your seat and do the?
01:04:51Bingo! Okay, here we go, ready?
01:04:55All right, so you guys need to cuddle around, place your, ouch! It's hot. That's why I have the mitt.
01:05:04You can move it up front.
01:05:05Yeah, put it up front so you guys can remember it. Daphne?
01:05:09Let's put them all (inaudible).
01:05:11Yeah, put it all on the pan.
01:05:15You've got it on the pan? All right, now you've got to look through the window and see what's happening.
01:05:20(inaudible) shrink it in?
01:05:21I don't know, we'll find- oh!
01:05:23(inaudible)
01:05:24Yeah, hold on.
01:05:26Trala, trala, da, da.
01:05:29Mine's (inaudible).
01:05:30So there should be five. Okay, here we go. All right, now crowd around and watch what happens.
01:05:38Jason.
01:05:41What's happening?
01:05:43Oh, (a whole lot of that). Oh, they were mine.
01:05:47Oh wow, look at that!
01:05:50Ew, they're like folding.
01:05:52they're like... //shrinking
01:05:53//And they're shrinking.
01:05:58And they're hardening as well, look.
01:05:59That one's going into kind of like a cup form.
01:06:04Ew!
01:06:05Okay.
01:06:07You gotta wait. Wait, wait, (inaudible), yeah-
01:06:09Let's see. Does it look like- does it look like they're done?
01:06:11//No, no-
01:06:12//No, they're still moving.
01:06:13They're still moving?
01:06:14(inaudible)
01:06:15Yeah, and they- (inaudible).
01:06:17Okay. Yeah, yours have flattened out now, okay, that's why I've got the oven mitt on, so I don't burn myself.
01:06:25These are hot, so you want to be very careful when you pick them up.
01:06:30That's mine.
01:06:32No, it's mine.
01:06:33Okay, very careful when you pick them up. There you go!
01:06:37It's not that hot.
01:06:40It's hot?
01:06:41Ah!
01:06:42That one's mine. Oh, no-
01:06:43//There you go.
01:06:44//They're steaming.
01:06:45They're hot?
01:06:46Yeah.
01:06:47No.
01:06:48I didn't think they were that hot. Okay.
01:06:51Okay, team Ten, team Nine, if you guys are ready.
01:06:59Okay, place it on the pan.
01:07:01Pan's hot.
01:07:02Anywhere on the pan- yes, the pan's hot, so be careful.
01:07:06Ooh.
01:07:07Now, can we taste this stuff?
01:07:09No, you cannot taste it. Jim-
01:07:13I know, it's because it's close to lunch, too. Gimme your plastics and put them on a pan.
01:07:20(He'll get it), (inaudible). Yeah.
01:07:22What were you baking in here earlier?
01:07:24I was-
01:07:25(inaudible)
01:07:26Yeah.
01:07:27Yeah, I make my little cinnamon rolls on here. Okay, here we go.
01:07:29We should make some (inaudible).
01:07:31Now, you ladies need to come around here so you can see what's going on in the window.
01:07:35Okay? Make some observations about what's going on with the plastic through the window.
01:07:39Okay, scoot in closer. It shouldn't explode.
01:07:42Oh, look at that (inaudible).
01:07:45Oh!
01:07:46It's really... look!
01:07:47It's, like, turning into pieces of cheese.
01:07:50Cool.
01:07:51Oh, it's like that- it's like that commercial, whenever they get small and hard,
01:07:53and then you can, like, (inaudible) them to your (inaudible) and everything.
01:07:57How are we supposed to make it, (inaudible)?
01:07:59It's like- it's like, (inaudible).
01:08:04//It looks like, (inaudible) in seven years.
01:08:07Oh my god!
01:08:11So you think they're done, now?
01:08:13No.
01:08:14No?
01:08:15Until they get brown, then they're done.
01:08:18So what do think's happened to those polymer chains?
01:08:21They (squish) up to (inaudible).
01:08:23Shrinking.
01:08:24Yeah. Yeah.
01:08:26Okay, okay, (they're done) gentlemen //(inaudible)-
01:08:28//You think they're done? Okay, Aimee, let me change places with you.
01:08:31Where's yours? Is it still there?
01:08:33Yeah, mine is, like, (inaudible) tiny.
01:08:35Whoa, gosh that smells.
01:08:37It's not on fire, is it?
01:08:39Not on fire?
01:08:40No, not like the other fire we had here the other day.
01:08:43Oh, I know, I can't believe that-
01:08:44Not my room.
01:08:46Still hot?
01:08:47No. It's just cool.
01:08:50Careful.
01:08:51That one's good. (I) get that one and that one right there-
01:08:55It's like glass.
01:08:56It's like- Cause it feels different, huh?
01:08:59Yeah it's hard.
01:09:00Mine's... oh, I see mine.
01:09:01It's so beautiful.
01:09:03Oh it's hot.
01:09:06It's like glass.
01:09:08Okay. Um, is there anybody else that's ready to put it in the oven? Okay, team Five and team Seven.
01:09:27Okay, put them down on the pan. Careful, pan's hot.
01:09:33I'm gonna scoot yours over just a tad so you guys want to remember where they're at.
01:09:36Gentlemen, over here.
01:09:39The pan is hot, so place them on there.
01:09:44Okay, now I want you to look through the window and I want you to observe what's happening.
01:09:48So gents, you guys need to come over here.
01:09:56Come on Dennis. Over here, Dennis the Menace.
01:09:58Come on, Stuart. Right here, right here, look.
01:10:04Jeff?
01:10:05Oh-.
01:10:06Oh my gosh, that's (mine).
01:10:09Oh, it's like a star.
01:10:13Oh my gosh, they're shrinking.
01:10:16Oh my gosh, mine's like a (polymer).
01:10:19Look at mine, mine's dying.
01:10:23So what do think are happening to the //chains?
01:10:25//They're shrinking.
01:10:26They're shrinking.
01:10:27Tightening-
01:10:28Yeah, they're kinda, maybe, kinda pulling back together, huh?
01:10:31Oh, you think they're done?
01:10:34Yeah.
01:10:35They're not moving anymore.
01:10:36Not moving anymore?
01:10:37(inaudible)
01:10:39What do you think would happen if I left them in here for a long, long time?
01:10:42They're barely (inaudible). They'd probably disappear.
01:10:45Or they melt?
01:10:46They might melt.
01:10:48Okay.
01:10:52I'm trying to flatten them down, that way it'll be easier for you to take measurements,
01:10:55because you need to notice that they definitely were curled (up the pad). //Okay?
01:11:00//They're so small.
01:11:11Oopsy. Come on over here, this one's real small.
01:11:15That's (inaudible).
01:11:16Okay. All righty, they're you go gents, find- and ladies find yours.
01:11:25Yeah.
01:11:26It's hot.
01:11:27Are you ready? Okay team Three, in the window.
01:11:31Oh, oh, me!
01:11:36Okay, place them on the pan. The pan's hot, so be careful.
01:11:41One, 25, two.
01:11:44Jim?
01:11:45Okay.
01:11:48//Okay, hold on one sec. Everybody's plastic is on there?
01:11:50Mm-hm.
01:11:51Okay, watch what's happening through the window.
01:12:11(inaudible) reference, that it's smooth. I mean, its still, like, see-through.
01:12:15And it got (denser).
01:12:16Yeah. So it's, like, harder to trace and everything.
01:12:24Do you guys need to go? You guys need to go, right?
01:12:29Team Two and... team Eight.
01:12:34What's happening to the polymer chains?
01:12:39They're shrinking.
01:12:40They're shrinking?
01:12:41Mm-hm.
01:12:42Mm.
01:12:43Is this (one)?
01:12:45What's yours?
01:12:46I don't know yet.
01:12:49What are you doing? That was fine.
01:12:51No it wasn't.
01:12:52It was, it was right on the (inaudible).
01:12:54Let me get in here again.
01:12:56They're tiny.
01:12:58Ah, they're tiny.
01:12:59They're tiny.
01:13:00Okay. This is why-
01:13:03Let me grab it.
01:13:04I'll just- no, no, don't grab.
01:13:08It's all (hard).
01:13:10Yeah, you can take it, they're a little hot, so you want to be careful.
01:13:14Oh, Arthur, they're not that hot.
01:13:16It burns.
01:13:18Is there a smell?
01:13:27All right, team Two and team Eight?
01:13:30Yes!
01:13:39Okay, put this on the- oh, gosh you guys have big ones.
01:13:48Miss (inaudible)?
01:13:49Yes?
01:13:50(inaudible)?
01:13:52No, hold on to them.
01:13:53Mine is cooler than yours.
01:13:56Mine is cooler than yours.
01:13:59I wonder what would happen if I'd put my hand in there.
01:14:01What do you think, Cedrick?
01:14:02I don't know, maybe it'll-
01:14:04Shrink.
01:14:05This is yours, the little seven.
01:14:06All righty. There you go, look.
01:14:10I thought you got cancer from working with (inaudible).
01:14:12That's a toaster oven.
01:14:17Oh, it won't work.
01:14:21Nothing works on there.
01:14:24Um, ladies and gents... shh. I forgot-
01:14:29ladies and gents, eyeballs for one quick second please, I forgot to mention something to you.
01:14:36Please do not throw your little piece of plastic in the trash can. When you're done, bring it back to your table and I'll give you some tape.
01:14:43You're going to tape it on your paper. Okay?
01:14:45Okay, how are you guys coming along?
01:14:47We're (inaudible) small, and smaller (inaudible).
01:14:50Mine's (the small one).
01:14:51Mine's the biggest. Mine's the biggest in there.
01:14:58Yeah, so what do you think happened?
01:15:01Hey, mine went back up.
01:15:04Hey, mine spins.
01:15:10There you go. There you go.
01:15:13Oh my god, it's so hot.
01:15:15Be careful, they're all hot.
01:15:28I don't even remember what mine looks like.
01:15:30No, go sit down gents.
01:15:34All right, is there anybody here that needs- left to uh, put them in the oven? It's just one more group?
01:15:42Okay, number six, come on up, and the other part of number six, last four ladies. Okay, put it in. Oh, nice big ones!
01:15:53Yeah.
01:15:55Is it kinda- is it kinda going-
01:15:56Ginger, do you have yours? You need to come up here. Cause you need to- to see what's going on.
01:16:10And there we go.
01:16:15I've got (inaudible).
01:16:17No, but the little curvy parts run (inaudible) a little bumpy.
01:16:21Oh, my god it will leak!
01:16:24Hey, calm down.
01:16:27Jim, question?
01:16:28(inaudible) I'm stapling it to-
01:16:31No, no staples, just have (a seat).
01:16:32Okay.
01:16:33(inaudible) hotdog.
01:16:35They look like bugs.
01:16:38(inaudible) sick.
01:16:40It's like- (inaudible), man, mine is gonna die.
01:16:46They can- ew.
01:16:48Oh, okay. Do you think they're done?
01:16:50Yeah.
01:16:51Mm-hm, yes.
01:16:52Some are shrinking.
01:16:53You think so? Okay.
01:16:54This looks like a bow.
01:16:57I keep forgetting, I have the mitt on the right hand.
01:17:07Ah, they're small-
01:17:10My gosh! Where did it go?
01:17:11Oh it went in the water. Hold on, not a problem. It just got a cold, that's all.
01:17:19Okay, there you go.
01:17:21Can we take it away?
01:17:22Yeah. Take them away, they're yours.
01:17:33How are- What are you gents doing?
01:17:35He's trying to touch my (inaudible).
01:17:37I need to trace it, okay? I need to trace it.
01:17:40Look, it's not even level at- as it is.
01:18:00What are you supposed to be doing?
01:18:01Questions.
01:18:02Um, we're being- ah, we're answering the questions.
01:18:04Uh-huh, correct.
01:18:05Do we answer it right here on the back?
01:18:07"Questions."
01:18:08Yes?
01:18:10Will we have, like, (some rock band or) some background music?
01:18:14(inaudible) number two (inaudible)?
01:18:20Daphne, if you hold on, I'll explain that when I get more of the class sitting down together.
01:18:24Is that what you have the question about, number two?
01:18:27Yeah. Most of you do, and I will tell you what I want you to do with that, let me wait for the- just go on to number three if you can.
01:18:40Ladies and gents, and you have about 10 minutes left in the lab situation, making calculations-uh, making measurements.
01:18:53Can we have this piece of plastic?
01:18:54Yeah, hold on.
01:18:59Are you gents done?
01:19:00//Yeah.
01:19:01//And my suggestion is to have a seat and work on your questions.
01:19:13Let me check your masses here. Have you done masses yet?
01:19:17Yeah.
01:19:18Before and after mass?
01:19:19Grams?
01:19:20Yes, in the grams.
01:19:22Okay.
01:19:23Yeah, mine are done.
01:19:24Oh, oh yeah. So we're at seventy (point) two.
01:19:31//Shh.
01:19:33Oh, here's a square.
01:19:36It was my square, not-
01:19:39Well, are you done with your stuff?
01:19:40Yeah, I'm doing this-
01:19:45Did you take a mass of this yet? After?
01:19:49Uh, oh no, I didn't.
01:19:50No.
01:19:51Did all that, though-
01:19:52Mm-hm.
01:19:53Hey (inaudible), let me check- let me check something here.
01:19:59Oh, excellent, excellent. Okay, good! Good job.
01:20:06Oh, so you're saying-
01:20:14Mine needs to be (inaudible).
01:20:16Why didn't you come up there when I asked your group to come up there, Arthur?
01:20:20Uh, because I wasn't finished tracing it and measuring it and (inaudible) it.
01:20:25I just need to do one thing to it first.
01:20:32Ladies, how are we coming along?
01:20:34(There).
01:20:35Okay, let me check your masses.
01:20:40Point six and a- okay that's different, let's see-
01:20:44Mass, excellent. Excellent, excellent, very good job!
01:20:53Dude, that one thing- this is (inaudible) zero.
01:21:03Watch what happens.
01:21:06Annabel. I'm going to pass around some tape, what I want you to do is tape that on your paper, okay?
01:21:15As soon as I get the rest of the class situated, I'll pass out the tape.
01:21:17It smells like muffins now. Before it smelled like gingerbread and now it smells like muffins.
01:21:22Bart.
01:21:23And it tastes like glass. Before it tasted like rubber (inaudible).
01:21:30What are you doing, Benny?
01:21:34Okay, then we need to answer number two and not talk to Charlotte.
01:21:36All right.
01:21:38Dude, your square doesn't even look like a square.
01:21:40//That's (not) his.
01:21:41//(inaudible) mine.
01:21:42I cut the wrong one.
01:21:43Has anything happened yet?
01:21:45Yeah.
01:21:46Yeah, you're done. Good.
01:21:52It's hot. So you want to be careful, okay?
01:21:56(Can I fold it)?
01:21:57Hm?
01:21:58Can I fold it?
01:21:59Okay, good.
01:22:03Jim, no more.
01:22:07Miss (inaudible), can I answer (inaudible)?
01:22:09Absolutely.
01:22:11Miss (inaudible), I can write (inaudible).
01:22:16Miss (inaudible), I (was born) to terrorize myself.
01:22:19Mm.
01:22:23(inaudible) those fractions.
01:22:24Huh?
01:22:25Get rid of the fractions.
01:22:26(inaudible) two grams, after.
01:22:29Two grams.
01:22:31How big is yours?
01:22:32I don't know, let me measure.
01:22:35What's Cedrick's?
01:22:38Three point four grams.
01:22:41Cedrick's is three point //four grams?
01:22:42//Three point two grams.
01:22:43You mean centimeters.
01:22:47Three point four- I mean, centimeters.
01:22:50Okay.
01:22:51And two-
01:22:52(inaudible) this one there?
01:22:55Yes. This is yours?
01:22:57Yeah, that's mine and that's my small one.
01:23:00Okay. Okay, yes, you need to put that on your paper.
01:23:04Okay. One-
01:23:08Okay. I have a question for you.
01:23:10All right.
01:23:11Before heating you had point nine grams, after heating you had point six grams?
01:23:15Uh-huh.
01:23:17Hm. What happened when you- did some of the molecules go away? I mean point six is less than point nine and where-
01:23:24what happened to the molecules?
01:23:26They reduced.
01:23:28They reduced? Where did they go?
01:23:30Uh, they melted?
01:23:32Mm-hm, I don't know if they melted.
01:23:36Disintegrated.
01:23:37Disintegrated?
01:23:39The characteristics before: this was thin, right?
01:23:42Wasn't this //thin before?
01:23:43//Yeah.
01:23:44It's only a //physical change, not a chemical change.
01:23:45//And flexible?
01:23:46Yeah, and now it's thick and not very flexible.
01:23:48It's not very flexible, but it's still thick. So do you still have the same amount of molecules in there?
01:23:53Um, yes.
01:23:54Yes. So what should these answers be?
01:23:57The same?
01:23:58Bingo!
01:24:05Oh no, Miss (inaudible)?
01:24:06Yes?
01:24:07Do we write the questions?
01:24:09What is going on gentlemen? Benny, what going on?
01:24:15Nothing.
01:24:17Charlotte, question?
01:24:19I haven't.
01:24:20Okay.
01:24:22Do we write the questions?
01:24:24You never need to write the questions. You guys should know that.
01:24:27There's no room for it (inaudible).
01:24:29Right.
01:24:31If you're at your desk, you need to be working on the questions by yourself.
01:24:51Okay, I'm gonna go ahead and pass around some tape. Make sure that you tape your little piece of plastic down-
01:25:02To what?
01:25:05I knew that.
01:25:06You knew that?
01:25:12Gentlemen, (follow) my instructions.
01:25:16I've got, um, a few questions.
01:25:20(inaudible), this is very brittle.
01:25:23Yes it is.
01:25:25I broke it.
01:25:26It's not as flexible as it was before, was it?
01:25:28So you can say, before, it was more flexible than afterwards?
01:25:30Yeah. That's good. Good, good, good.
01:25:50Jason?
01:25:52Yes?
01:25:53Not this Jason, that Jason. Watch for the tape, the tape is going up and down the aisles.
01:25:59Okay.
01:26:05All right, now that I have most of you here, sitting down, let me go ahead and just kinda talk a little bit about the questions,
01:26:10because I know that there's probably a question here for number two.
01:26:17So, as soon as I have everybody's eyeballs up here-
01:26:24Okay.
01:26:25Question one, it said: "What happened to the polymer when it was heated?"
01:26:29And what I want you to do is I want you to explain that, okay, what happened to the polymers,
01:26:34why do you think it happened, explain what you saw inside the toaster oven.
01:26:38Number two. Your polymer should have had the same mass before and after heating.
01:26:44This is what we call a conservation of mass, because the root word is "to conserve."
01:26:50Some of you in here when I was walking around the room- a lot of you hit this right on target, man, you got the same mass.
01:26:57Good job! Good job of measurement.
01:26:59Some of you in here, however, didn't get the same mass and Jason, Jason, were you the one I had the conversation with?
01:27:06Yeah.
01:27:07Where- where- did the molecules go anywhere? Did you still have the same amount of stuff- that you had when you started?
01:27:15Yeah! So what did you just do to the mass, what did that mass look like at the beginning?
01:27:21What did your piece of plastic look like at the beginning, before you put it in the oven?
01:27:24Bigger. And thinner.
01:27:26It was maybe a lot bigger and thinner. What happened to you after you heated it?
01:27:30It shrunk and got really thick and not as flexible.
01:27:34Yeah, it just kinda shrunk, but it got thicker. So you just kinda changed the volume, but the mass is still there. Okay?
01:27:42Explain- and I kinda helped explain that just now- but I want you to explain why they should have had the same mass,
01:27:48and put that in your own words.
01:27:50Number three: "How do you think the polymer chains are arranged?"
01:27:54Now we're going back to this thing that we started at the beginning of the class period,
01:27:58about the polymers and the polymer chains being arranged.
01:28:00How do you think they're arranged, and how do you think the arrangement of the chains influenced the behavior of the plastic container?
01:28:10For example-
01:28:21Uh, for example, prior to heating, your plastic looked one way, after heating the plastic looked another way.
01:28:30What happened to the chains? Were they parallel, were they crisscross, what happened to them?
01:28:38Tape is coming around too, make sure that you tape your little piece of plastic on your paper.
01:28:54(inaudible) piece of plastic?
01:28:58It's at (Benny's.)
01:28:59Go get it.
01:29:28Okay.
01:29:32Thank you.
01:29:37Jason?
01:29:38Yeah.
01:29:39Is this yours?
01:29:41(inaudible)
01:29:42Okay.
01:30:04Okay, Good.
01:30:15You need to tape that on there. With tape.
01:30:19Tape it on?
01:30:20Tape it on there. Not tape it around, tape it on.
01:30:43Stuart, you're totally done? Okay, good.
01:30:52(inaudible) question (inaudible).
01:30:55Okay.
01:30:59Okay, good.
01:31:08Can we (sit there)?
01:31:09Guys, don't worry about stapling your papers- you know I don't like papers stapled-
01:31:13just make sure that your names are on both papers, if you have more than one.
01:31:57When you're done, I want you to think about what you want to add to your, um, cheat sheet over here.
01:32:14Charlotte?
01:32:17I didn't get this other question.
01:32:19Okay, it says: "How do you think polymer chains are arranged?"
01:32:21Well, you know that we talked about polymer chains being arranged two different ways, remember that?
01:32:29Parallel and crisscrossed, remember? How did the arrangement- so how do you think the chains are arranged in a plastic?
01:32:37Um, I think parallel, because you see the (inaudible).
01:32:42Okay, then how do the arrangement of the chains influence the behavior of the plastic container?
01:32:47In other words the chains were arranged in a certain way based on what you said.
01:32:52When you heated it, how did that- what did that to the plastic container?
01:32:58Mm-hm.
01:33:01I know.
01:34:38(inaudible)
01:34:39Mm-hm. That's right. Tell me, how do you know that? What did you observe happening in the toaster oven?
01:34:48It went up.
01:34:49Mm, yeah.
01:34:55Okay, guys, Jim you have a question?
01:34:57No.
01:34:58Okay, bell is gonna be ringing in about two minutes. Let me share with you before the bell rings what I want you to do with these papers.
01:35:05If they're not done, finish them for homework, I see you again tomorrow.
01:35:10Very quickly, put them into the pit section of the notebook, go ahead and pack up, but don't be too loud,
01:35:18because I have to tell you something at the end of the class period. Okay.
01:35:45Yes?
01:35:46(inaudible) for the last time?
01:35:48No, I didn't.
01:35:49(inaudible)
01:35:50That happened with Escondido, huh, a boy in Escondido? Yeah, no, I didn't see that.
01:35:56Guys, quickly, quickly and quietly, I have a couple of things I need to share with you about what's gonna happen in class tomorrow.
01:36:05So while you're packing up, you guys can listen.
01:36:08I think I mentioned to you at the beginning of class period today, that when you come into class tomorrow, you're going to take a test.
01:36:16You're going to take a science assessment test tomorrow.
01:36:20This is a test that, uh- see the two boxes over there, the test is in the box.
01:36:24You guys remember like your SAT nine test that you took last year? Remember, you bubbled everything in?
01:36:29Yeah.
01:36:30Okay, this isn't a bubbling type of test, this is a hands on performance type of a test that you're going to be taking tomorrow
01:36:37and it's going to take us the entire class period.
01:36:40So I really would like for you guys to come in, uh- you know, having had something to eat in the morning, maybe, at break,
01:36:47and come in and like I said you can leave your science notebooks at home because you're not gonna need them tomorrow.
01:36:56Hold onto your polymer assignment until next Tuesday, because then what we'll do is that we'll kinda touch base a little bit
01:37:03about some of things that you found out about polymers, on Tuesday, from these activities,
01:37:09and we're going to go ahead and we're going to add it to the piece of paper over there, okay?
01:37:14Okay, are they're any questions?
01:37:19Questions? Questions?
01:37:22Okay, let me double-check.
01:37:28Let's see, actually, yeah.
01:37:34No. The bell should have rung by now, or do we have one more minute?
01:37:40It's 11:48.
01:37:41Oh. Okay, we have one more minute. Okay. All right, well then I'll ask you this.
01:37:46What can we add to this, real quick?
01:37:49Does anybody in here want to put- raise their hand up and tell me what I can add to the piece of paper?
01:37:54What did you learn about polymers from this lab today? What did you learn that they can do?
01:38:00Aha!
01:38:02What did you learn? Dave?
01:38:04They can change.
01:38:06How can they change?
01:38:08Uh, criss- from parallel to crisscross.
01:38:11They really can't change from a parallel to a crisscross, we'll talk about that, we'll talk about that next class period.
01:38:18Uh, let's see, Samantha?
01:38:21They could become smaller when you heat them.
01:38:25When you heat them what can we do to those long polymer chains? We can?
01:38:29Shrink them.
01:38:30We can shrink them, yeah. So polymer chains can expand, and polymer chains can?
01:38:37(inaudible)
01:38:40But you know when they shrink, they get stronger?
01:38:43Yes, they do. Good and we'll talk about that also next class period.
01:38:51Good.
01:38:53(I'm just bringing this), okay? Since I was such a good kid?
01:38:56And what are you gonna do with the balloon?
01:38:57I won't blow it up here in class, I'll wait till you're home.
01:39:00Because if you blow the balloon and you get in trouble here at school.
01:39:04I'll be good.
01:39:05Okay, you gotta promise.
01:39:06I'll- I- and even if I (inaudible), I'll say it wasn't you.
01:39:09Oh yeah.
01:39:10I'll say I found it on the ground.
01:39:11Oh yeah, thanks.
01:39:13Have a nice day.
01:39:14You too.